―The river runs clear. ―We all appreciate the importance the local government has_______ the environmental protection.

To test eggs , ___them in a bowl of water: if they float they are bad; if they sink they are good.

Smoking, ____ some smokers, might ease their anxiety sometimes, but ____ the addiction caused by their constant practice, it is really hard to give up.

The next morning she found the man ___________ in bed, dead.

Rod loves      clocks.  However, he never manages to put them together again.